DETROIT — State police are handling the investigation of a shooting that occurred on northbound Interstate 75 in Southwest Detroit during rush hour Tuesday.

The shooting occurred about 4:30 p.m. and the highway remained closed as of 6:30 p.m. Tuesday.

State Police Lt. Michael Shaw said dispatch initially received a call about a crash in the area of I-75 and Grand, about 1.4 miles beyond the shooting.

Around the same time, Shaw said an off-duty police officer reported hearing gunshots in the area of Livernois and I-75. When state police troopers arrived, they found a man and woman in a silver Oldsmobile Silhouette minivan.

The woman suffered a nonfatal gunshot to her leg. The man was uninjured.

Shaw said police the shooting was not random and they are looking for the suspect, who has been identified.

Two other vehicles were involved in a crash following the shooting. The extent of their injuries was not immediately known, but not believed to be fatal.

The incident occurred near Livernois Road. Check back with MLive for more details as they are released.